More digression- A Confederate frigate built during the Civil War also was named the "City of Savannah," and there were others.
There is a hornpipe tune called the "City of Savannah," and this may be the tune used by Malloy.
I found Frank Livingstone listed as composer (link), but I don't know where he comes into it either. This website has some errors in their 'discussion.'
http://www.thesession.org/tunes/display/1607/comments